Lindsay Lohan was hospitalized on Sunday night -- reportedly with a bad lung infection. Even though she was "rushed to the hospital," TMZ.com confirmed that she was discharged with antibiotics after a short stay.  Lindsay had reportedly been telling friends she's been suffering from "walking pneumonia" over the last couple weeks. Her condition apparently worsened over the weekend, prompting the dramatic emergency room trip.  TMZ.com reported that Lohan was taken to Mt. Sinai in NYC, where she received medication. She was discharged and sent back to her hotel room.